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C23 makes various standard library functions, that return a pointer
into an input array, into macros that return a pointer to const when
the relevant argument passed to the macro is a pointer to const. (The
requirement is for macros, with the existing function types applying
when macro expansion is suppressed. When a null pointer constant is
passed, such as integer 0, that's the same as a pointer to non-const.)
Implement this feature. This only applies to C, not C++, since such
macros are not an appropriate way of doing this for C++ and all the
affected functions other than bsearch have overloads to implement an
equivalent feature for C++ anyway. Nothing is done to apply such a
change to any non-C23 functions with the same property of returning a
pointer into an input array.
The feature is also disabled when _LIBC is defined, since there are
various places in glibc that either redefine these identifiers as
macros, or define the functions themselves, and would need changing to
work in the presence of these macro definitions. A natural question
is whether we should in fact change those places and not disable the
macro definitions for _LIBC. If so, we'd need a solution for the
places in glibc that define the macro *before* including the relevant
header (in order in effect to disable the header declaration of the
function by renaming that declaration).
One testcase has #undef added to avoid conflicting with this feature
and another has const added; -Wno-discarded-qualifiers is added for
building zic (but could be removed once there's a new upstream tzcode
release that's const-safe with this C23 change and glibc has updated
to code from that new release). Probably other places in glibc proper
would need const added if we remove the _LIBC conditionals.
Another question would be whether some GCC extension should be added
to support this feature better with macros that only expand each
argument once (as well as reducing duplication of diagnostics for bad
usages such as non-pointer and pointer-to-volatile-qualfied
arguments).
Tested for x86_64.
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Signed-off-by: Justin King <jcking@google.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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The support for lock elision was already deprecated with glibc 2.42:
commit 77438db8cfa6ee66b3906230156bdae11c49a195
"Mark support for lock elision as deprecated."
See also discussions:
https://sourceware.org/pipermail/libc-alpha/2025-July/168492.html
This patch removes the architecture specific support for lock elision
for x86, powerpc and s390 by removing the elision-conf.h, elision-conf.c,
elision-lock.c, elision-timed.c, elision-unlock.c, elide.h, htm.h/hle.h files.
Those generic files are also removed.
The architecture specific structures are adjusted and the elision fields are
marked as unused. See struct_mutex.h files.
Furthermore in struct_rwlock.h, the leftover __rwelision was also removed.
Those were originally removed with commit 0377a7fde6dfcc078dda29a1225d7720a0931357
"nptl: Remove rwlock elision definitions"
and by chance reintroduced with commit 7df8af43ad1cd8ce527444de50bee6f35eebe071
"nptl: Add struct_rwlock.h"
The common code (e.g. the pthread_mutex-files) are changed back to the time
before lock elision was introduced with the x86-support:
- commit 1cdbe579482c07e9f4bb3baa4864da2d3e7eb837
"Add the low level infrastructure for pthreads lock elision with TSX"
- commit b023e4ca99f5e81f90d87d23cd267ef2abd2388c
"Add new internal mutex type flags for elision."
- commit 68cc29355f3334c7ad18f648ff9a6383a0916d23
"Add minimal test suite changes for elision enabled kernels"
- commit e8c659d74e011346785355eeef03b7fb6f533c61
"Add elision to pthread_mutex_{try,timed,un}lock"
- commit 49186d21ef2d87986bccaf0a7c45c48c91b265f3
"Disable elision for any pthread_mutexattr_settype call"
- commit 1717da59aed9612becd56aaa1249aac695af4c8a
"Add a configure option to enable lock elision and disable by default"
Elision is removed also from the tunables, the initialization part, the
pretty-printers and the manual.
Some extra handling in the testsuite is removed as well as the full tst-mutex10
testcase, which tested a race while enabling lock elision.
I've also searched the code for "elision", "elide", "transaction" and e.g.
cleaned some comments.
I've run the testsuite on x86_64 and s390x and run the build-many-glibcs.py
script.
Thanks to Sachin Monga, this patch is also tested on powerpc.
A NEWS entry also mentions the removal.
Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
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Update to latest text from Gnulib commit
08f579c56d81cf78c60fcd3568190f97e6e7f684, file doc/lgpl-2.1.texi.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
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As discussed in bug 28327, C23 changed the fromfp functions to return
floating types instead of intmax_t / uintmax_t. (Although the
motivation in N2548 was reducing the use of intmax_t in library
interfaces, the new version does have the advantage of being able to
specify arbitrary integer widths for e.g. assigning the result to a
_BitInt, as well as being able to indicate an error case in-band with
a NaN return.)
As with other such changes from interfaces introduced in TS 18661,
implement the new types as a replacement for the old ones, with the
old functions remaining as compat symbols but not supported as an API.
The test generator used for many of the tests is updated to handle
both versions of the functions.
Tested for x86_64 and x86, and with build-many-glibcs.py.
Also tested tgmath tests for x86_64 with GCC 7 to make sure that the
modified case for older compilers in <tgmath.h> does work.
Also tested for powerpc64le to cover the ldbl-128ibm implementation
and the other things that are handled differently for that
configuration. The new tests fail for ibm128, but all the failures
relate to incorrect signs of zero results and turn out to arise from
bugs in the underlying roundl, ceill, truncl and floorl
implementations that I've reported in bug 33623, rather than
indicating any bug in the actual new implementation of the functions
for that format. So given fixes for those functions (which shouldn't
be hard, and of course should add to the tests for those functions
rather than relying only on indirect testing via fromfp), the fromfp
tests should start passing for ibm128 as well.
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It has been added on Linux 6.10 (8be7258aad44b5e25977a98db136f677fa6f4370)
as a way to block operations such as mapping, moving to another location,
shrinking the size, expanding the size, or modifying it to a pre-existing
memory mapping.
Although the system only works on 64-bit CPUs, the entrypoint was added
for all ABIs (since the kernel might eventually implement it for additional
ones and/or the ABI can execute on a 64-bit kernel).
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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The definition of once_flag conflicts with std::once_flag in
if “using namespace std;” is active.
Updates commit a7ddbf456d97ac8d1aa7afd735e196a1488bd874
("Add once_flag, ONCE_FLAG_INIT and call_once to stdlib.h for C23").
Suggested-by: Jonathan Wakely <jwakely@redhat.com>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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* include/features.h (_POSIX_C_SOURCE): Document the value of 202405L
for POSIX.1-2024. Set it to 202405L when _GNU_SOURCE or _DEFAULT_SOURCE
is defined.
(_XOPEN_SOURCE): Document the value of 800 for POSIX-1.2024. Set it to
800 when _GNU_SOURCE is defined.
(__USE_XOPEN2K24, __USE_XOPEN2K24XSI): New internal macros. Set them
when _POSIX_C_SOURCE is 202405L or greater and/or when _XOPEN_SOURCE is
800 or greater.
* manual/creature.texi (Feature Test Macros): Document the new values
for _POSIX_C_SOURCE and _XOPEN_SOURCE.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
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The Dynamic Linker chapter now includes a new section detailing
environment variables that influence its behavior.
This new section documents the `LD_DEBUG` environment variable,
explaining how to enable debugging output and listing its various
keywords like `libs`, `reloc`, `files`, `symbols`, `bindings`,
`versions`, `scopes`, `tls`, `all`, `statistics`, `unused`, and `help`.
It also documents `LD_DEBUG_OUTPUT`, which controls where the debug
output is written, allowing redirection to a file with the process ID
appended.
This provides users with essential information for controlling and
debugging the dynamic linker.
Reviewed-by: DJ Delorie <dj@redhat.com>
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The C2y function uimaxabs has been renamed to umaxabs. Implement this
change in glibc, keeping a compat symbol under the old name, copying
the test to test the new name and changing the old test to test the
compat symbol. Jakub has done the corresponding change to the
built-in function in GCC.
Tested for x86_64 and x86.
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Add the C23 memalignment function (query the alignment of a pointer)
to glibc.
Given how simple this operation is, it would make sense for compilers
to inline calls to this function, but I'm treating that as a compiler
matter (compilers should add it as a built-in function) rather than
adding an inline version to glibc headers (although such an inline
version would be reasonable as well). I've filed
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122117 for this feature
in GCC.
Tested for x86_64 and x86.
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* manual/socket.texi (Out-of-Band Data): Check the atmark variable which
is set by the ioctl instead of the undefined result variable.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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The syscall() function allows to make system calls directly, however,
in the case of system calls that affect internal state of process or
thread, the caller would have to take care of extensive setup necessary
for the internals of Glibc to work correctly in the child threads. This
may make using syscall() with these syscall numbers impractical and
prone to undefined behaviour.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* manual/errno.texi (Error Messages): Add error_print_progname to the
variable index.
* manual/sysinfo.texi (Host Identification): Fix typo of the
getdomainname function.
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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C23 adds once_flag, ONCE_FLAG_INIT and call_once to stdlib.h (in C11
they were only in threads.h, in C23 they are in both headers; this
change came from N2840). Implement this change, with a
bits/types/once_flag.h header for the common type and initializer
definitions.
Note that there's an omnibus bug (bug 33001) that covers more than
just these missing definitions.
This doesn't seem a significant enough feature to be worth mentioning
in NEWS.
ISO C is not concerned with whether functions are in libc or
libpthread, but POSIX links this to what header they are declared in,
so functions declared in stdlib.h are supposed to be in libc.
However, the current edition of POSIX is based on C17; hopefully Hurd
glibc will have completed the merge of libpthread into libc (in
particular, moving call_once) well before a future edition of POSIX
based on C23 (or a later version of ISO C) is released.
Tested for x86_64 and x86.
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Add the C23 memset_explicit function to glibc. Everything here is
closely based on the approach taken for explicit_bzero. This includes
the bits that relate to internal uses of explicit_bzero within glibc
(although we don't currently have any such internal uses of
memset_explicit), and also includes the nonnull attribute (when we
move to nonnull_if_nonzero for various functions following C2y, this
function should be included in that change).
The function is declared both for __USE_MISC and for __GLIBC_USE (ISOC23)
(so by default not just for compilers defaulting to C23 mode).
Tested for x86_64 and x86.
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Previously this file failed to compile with the following errors:
$ gcc manual/examples/inetcli.c
manual/examples/inetcli.c: In function ‘write_to_server’:
manual/examples/inetcli.c:36:37: error: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration]
36 | nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
| ^~~~~~
manual/examples/inetcli.c:26:1: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
25 | #include <netdb.h>
+++ |+#include <string.h>
26 |
manual/examples/inetcli.c:36:37: warning: incompatible implicit declaration of built-in function ‘strlen’ [-Wbuiltin-declaration-mismatch]
36 | nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
| ^~~~~~
manual/examples/inetcli.c:36:37: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file failed to compile with the following errors:
$ gcc manual/examples/inetsrv.c
manual/examples/inetsrv.c: In function ‘main’:
manual/examples/inetsrv.c:97:31: error: passing argument 3 of ‘accept’ from incompatible pointer type [-Wincompatible-pointer-types]
97 | &size);
| ^~~~~
| |
| size_t * {aka long unsigned int *}
In file included from manual/examples/inetsrv.c:23:
/usr/include/sys/socket.h:307:42: note: expected ‘socklen_t * restrict’ {aka ‘unsigned int * restrict’} but argument is of type ‘size_t *’ {aka ‘long unsigned int *’}
307 | socklen_t *__restrict __addr_len);
| ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
manual/examples/inetsrv.c:105:26: error: implicit declaration of function ‘inet_ntoa’ [-Wimplicit-function-declaration]
105 | inet_ntoa (clientname.sin_addr),
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file failed to compile with the following errors:
$ gcc manual/examples/filesrv.c
manual/examples/filesrv.c: In function ‘main’:
manual/examples/filesrv.c:37:3: error: implicit declaration of function ‘unlink’ [-Wimplicit-function-declaration]
37 | unlink (SERVER);
| ^~~~~~
manual/examples/filesrv.c:40:10: error: implicit declaration of function ‘make_named_socket’ [-Wimplicit-function-declaration]
40 | sock = make_named_socket (SERVER);
| ^~~~~~~~~~~~~~~~~
manual/examples/filesrv.c:46:54: error: passing argument 6 of ‘recvfrom’ from incompatible pointer type [-Wincompatible-pointer-types]
46 | (struct sockaddr *) & name, &size);
| ^~~~~
| |
| size_t * {aka long unsigned int *}
In file included from manual/examples/filesrv.c:21:
/usr/include/sys/socket.h:165:48: note: expected ‘socklen_t * restrict’ {aka ‘unsigned int * restrict’} but argument is of type ‘size_t *’ {aka ‘long unsigned int *’}
165 | socklen_t *__restrict __addr_len);
| ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
This patch fixes the missing declaration for unlink and uses
'socklen_t *' for the fourth argument of recv from. The
make_named_socket function is defined in the manual.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Without _GNU_SOURCE defined this file fails to compile with the
following error:
$ gcc manual/examples/select.c
manual/examples/select.c: In function ‘input_timeout’:
manual/examples/select.c:44:10: error: implicit declaration of function ‘TEMP_FAILURE_RETRY’ [-Wimplicit-function-declaration]
44 | return TEMP_FAILURE_RETRY (select (FD_SETSIZE,
| ^~~~~~~~~~~~~~~~~~
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file would fail to compile with the following error:
$ gcc manual/examples/setjmp.c
manual/examples/setjmp.c: In function ‘main’:
manual/examples/setjmp.c:37:7: error: implicit declaration of function ‘do_command’ [-Wimplicit-function-declaration]
37 | do_command ();
| ^~~~~~~~~~
manual/examples/setjmp.c: At top level:
manual/examples/setjmp.c:42:1: warning: conflicting types for ‘do_command’; have ‘void(void)’
42 | do_command (void)
| ^~~~~~~~~~
manual/examples/setjmp.c:37:7: note: previous implicit declaration of ‘do_command’ with type ‘void(void)’
37 | do_command ();
| ^~~~~~~~~~
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file would fail to compile with the following error:
$ gcc manual/examples/sigh1.c
manual/examples/sigh1.c: In function ‘main’:
manual/examples/sigh1.c:46:3: error: implicit declaration of function ‘alarm’ [-Wimplicit-function-declaration]
46 | alarm (2);
| ^~~~~
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Without _GNU_SOURCE defined this file fails to compile with the
following error:
$ gcc manual/examples/strdupa.c
manual/examples/strdupa.c: In function ‘main’:
manual/examples/strdupa.c:27:19: error: implicit declaration of function ‘strdupa’; did you mean ‘strdup’? [-Wimplicit-function-declaration]
27 | char *wr_path = strdupa (path);
| ^~~~~~~
| strdup
manual/examples/strdupa.c:27:19: error: initialization of ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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GCC 15 turned -Wincompatible-pointer-types into a compiler error instead
of a warning by default. This patch prevents the following error:
$ gcc manual/examples/subopt.c
manual/examples/subopt.c: In function ‘main’:
manual/examples/subopt.c:64:40: error: passing argument 2 of ‘getsubopt’ from incompatible pointer type [-Wincompatible-pointer-types]
64 | switch (getsubopt (&subopts, mount_opts, &value))
| ^~~~~~~~~~
| |
| const char **
In file included from manual/examples/subopt.c:19:
/usr/include/stdlib.h:1100:47: note: expected ‘char * const* restrict’ but argument is of type ‘const char **’
1100 | char *const *__restrict __tokens,
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file would fail to compile with the following error:
$ gcc manual/examples/memopen.c
manual/examples/memopen.c: In function ‘main’:
manual/examples/memopen.c:28:30: error: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration]
28 | stream = fmemopen (buffer, strlen (buffer), "r");
| ^~~~~~
manual/examples/memopen.c:19:1: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
18 | #include <stdio.h>
+++ |+#include <string.h>
19 |
manual/examples/memopen.c:28:30: warning: incompatible implicit declaration of built-in function ‘strlen’ [-Wbuiltin-declaration-mismatch]
28 | stream = fmemopen (buffer, strlen (buffer), "r");
| ^~~~~~
manual/examples/memopen.c:28:30: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Without _GNU_SOURCE defined this file fails to compile with the
following error:
$ gcc manual/examples/twalk.c
manual/examples/twalk.c: In function ‘twalk’:
manual/examples/twalk.c:55:3: error: implicit declaration of function ‘twalk_r’; did you mean ‘twalk’? [-Wimplicit-function-declaration]
55 | twalk_r (root, twalk_with_twalk_r_action, &closure);
| ^~~~~~~
| twalk
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file would fail to compile with the following error:
$ gcc manual/examples/sigusr.c
manual/examples/sigusr.c: In function ‘child_function’:
manual/examples/sigusr.c:46:3: error: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration]
46 | exit (0);
| ^~~~
manual/examples/sigusr.c:23:1: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
22 | #include <unistd.h>
+++ |+#include <stdlib.h>
23 | /*@end group*/
manual/examples/sigusr.c:46:3: warning: incompatible implicit declaration of built-in function ‘exit’ [-Wbuiltin-declaration-mismatch]
46 | exit (0);
| ^~~~
manual/examples/sigusr.c:46:3: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file would fail to compile with the following error:
$ gcc manual/examples/mbstouwcs.c
manual/examples/mbstouwcs.c: In function ‘mbstouwcs’:
manual/examples/mbstouwcs.c:34:11: error: ‘errno’ undeclared (first use in this function)
34 | errno = EILSEQ;
| ^~~~~
manual/examples/mbstouwcs.c:5:1: note: ‘errno’ is defined in header ‘<errno.h>’; this is probably fixable by adding ‘#include <errno.h>’
4 | #include <wchar.h>
+++ |+#include <errno.h>
5 |
manual/examples/mbstouwcs.c:34:11: note: each undeclared identifier is reported only once for each function it appears in
34 | errno = EILSEQ;
| ^~~~~
manual/examples/mbstouwcs.c:34:19: error: ‘EILSEQ’ undeclared (first use in this function)
34 | errno = EILSEQ;
| ^~~~~~
manual/examples/mbstouwcs.c:47:20: error: implicit declaration of function ‘towupper’ [-Wimplicit-function-declaration]
47 | *wcp++ = towupper (wc);
| ^~~~~~~~
manual/examples/mbstouwcs.c:5:1: note: include ‘<wctype.h>’ or provide a declaration of ‘towupper’
4 | #include <wchar.h>
+++ |+#include <wctype.h>
5 |
manual/examples/mbstouwcs.c:47:20: warning: incompatible implicit declaration of built-in function ‘towupper’ [-Wbuiltin-declaration-mismatch]
47 | *wcp++ = towupper (wc);
| ^~~~~~~~
manual/examples/mbstouwcs.c:47:20: note: include ‘<wctype.h>’ or provide a declaration of ‘towupper’
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Previously this file would fail to compile with the following error:
$ gcc manual/examples/db.c
db.c: In function ‘main’:
db.c:37:7: error: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
37 | printf ("Couldn't find out about user %d.\n", (int) me);
| ^~~~~~
db.c:23:1: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
22 | #include <stdlib.h>
+++ |+#include <stdio.h>
23 |
db.c:37:7: warning: incompatible implicit declaration of built-in function ‘printf’ [-Wbuiltin-declaration-mismatch]
37 | printf ("Couldn't find out about user %d.\n", (int) me);
| ^~~~~~
db.c:37:7: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
db.c:42:3: warning: incompatible implicit declaration of built-in function ‘printf’ [-Wbuiltin-declaration-mismatch]
42 | printf ("I am %s.\n", my_passwd->pw_gecos);
| ^~~~~~
db.c:42:3: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Document the SHUT_* constants and attempt to explain the
implications for Linux TCP and UNIX domain sockets.
The Linux TCP behavior was discovered when writing the
socket/tst-shutdown test.
Suggested by Sergey Organov in
<https://inbox.sourceware.org/libc-help/qblfrh$4m4i$1@blaine.gmane.org/>.
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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Posix Issue 8 adds an implementation-defined item we don't already
cover, about seeking backwards. This defines our implentation.
https://issues.redhat.com/browse/RHEL-3008
https://pubs.opengroup.org/onlinepubs/9799919799/functions/open_memstream.html
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Reviewed-by Collin Funk <collin.funk1@gmail.com>
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Remove all unused atomics. Replace uses of catomic_increment and
catomic_decrement with atomic_fetch_add_relaxed which maps to a standard
compiler builtin. Relaxed memory ordering is correct for simple counters
since they only need atomicity.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Linux 6.14 adds the new flag for uncached buffered IO on a filesystem
supporting it.
This caused two test failures as these tests expected the flag
0x00000080 is unused. Add the flag definition to fix these tests on
Linux >= 6.14:
FAIL: misc/tst-preadvwritev2
FAIL: misc/tst-preadvwritev64v2
The test failures were not detected in routine test suite runs because
normally we create the test file in /tmp, where a tmpfs is usually
mounted, and tmpfs does not support this flag. But it can be reproduced
with TMPDIR set to some directory in an ext4 file system.
Link: https://git.kernel.org/torvalds/c/af6505e5745b
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* manual/message.texi (Advanced gettext functions): Refer to
libc-alpha@sourceware.org instead of bug-glibc-manual@gnu.org which no
longer exists.
* NEWS: Likewise.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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The select function, fd_set, and FD_* macros were standardized by POSIX
in the sys/select.h header. They are still defined in sys/types.h if
__USE_MISC is defined, but we should recommend the more portable and
standardized sys/select.h.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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The original example works on glibc since sys/time.h includes
sys/select.h. However, since POSIX requires that select is defined in
sys/select.h this change makes the example more portable.
Reported by Gavin Smith <gavinsmith0123@gmail.com> in:
<https://lists.gnu.org/archive/html/bug-texinfo/2025-07/msg00091.html>.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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The getsubopt function was an XSI extension since POSIX issue 4 until it
was added to Base in POSIX Issue 7. This also adds the 'restrict'
qualifier to the arguments as done in POSIX.1-2024, and has been the
case in glibc.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
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Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
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Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
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And add extra checks to enable for binutils 2.45 and if the architecture
explicitly enables it. When SFrame is disabled, all the related code
is also not enabled for backtrace() and _dl_find_object(), so SFrame
backtracking is not used even if the binary has the SFrame segment.
This patch also adds some other related fixes:
* Fixed an issue with AC_CHECK_PROG_VER, where the READELF_SFRAME
usage prevented specifying a different readelf through READELF
environment variable at configure time.
* Add an extra arch-specific internal definition,
libc_cv_support_sframe, to disable --enable-sframe on architectures
that have binutils but not glibc support (s390x).
* Renamed the tests without the .sframe segment and move the
tst-backtrace1 from pthread to debug.
* Use the built compiler strip to remove the .sframe segment,
instead of the system one (which might not support SFrame).
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
Reviewed-by: Sam James <sam@gentoo.org>
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Fixes commit 5dd2a19ad5218261cee064 ("termios: manual: improve the
explanation of various tty concepts") and commit c744519bad8106769760
("termios: manual: document the SPEED_MAX and BAUD_MAX constants").
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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Add the SPEED_MAX and BAUD_MAX constants to the manual.
[ v3: drop leading underscores ]
Signed-off-by: "H. Peter Anvin" (Intel) <hpa@zytor.com>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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It is a lot easier to understand the meaning of the tty interface if
it is explained from the beginning as conceptually emulating an RS232
serial port. This greatly simplifies the discussions of specific
items like the meaning of line speed.
Distinguish between "modem disconnect request" (deasserting DTR) and
"modem disconnect" (DCD deasserted). Conflating the two terms is
confusing, especially for non-RS232 devices. In particular, on most
systems, a pseudo-terminal will *not* respond to a modem disconnect
request by triggering a modem disconnect event for the purpose of the
HUPCL flag.
It is not necessarily true that the line speed has no effect on
non-serial port devices: e.g. an SPI port may interpret it as the
clock frequency to use; however, SPI does not use asynchronous framing
bits, instead synchronization is handled by the SS# wire. Similarly,
it is common but not by any means universal for interfaces that employ
various forms of fixed data to symbol rate encodings to encode the
data link layer bit rate rather than the physical symbol rate, which
may be higher (e.g. 8B10B) or lower (e.g. QAM/Trellis), without the
encoding or framing overhead.
Finally, a handful of devices use the line rate for entirely
nonstandard purposes. One example is Arduino USB interfaces, which
often interprets changing the baud rate to 1200 baud as a command to
reset the device.
[ v2: removed a bogus stray chunk from editing ]
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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The function cfsetospeed() is defined twice in the manual. Remove the
one that seems out of place.
Signed-off-by: "H. Peter Anvin" (Intel) <hpa@zytor.com>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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Fix a typo in the manual: tcsetattr misspelled as tcsettattr.
Signed-off-by: "H. Peter Anvin" (Intel) <hpa@zytor.com>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
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Enable SFrame stack track information. The --enable-sframe option
allows the glibc build to compile with SFrame stack track
information. Thus, enabling glibc's backtrace to work within glibc.
Signed-off-by: Claudiu Zissulescu <claudiu.zissulescu-ianculescu@oracle.com>
Reviewed-by: DJ Delorie <dj@redhat.com>
Reviewed-by: Sam James <sam@gentoo.org>
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